The shower pan liner was taken right out of your notes somewhere on this forum. Normally I do the job quick and easy with rope caulk or weatherstripping but you recommended the liner. Is the liner better than weatherstripping? I've no idea. It's more work but it's your design so I follow your guidelines.
I've found it's always a good idea to put speakers together exactly like the designer suggests. There are often reasons for doing things that are way above my pay grade.
The 4's are certainly sounding good. After a day of listening the gaskets seem to make even more of a difference than at first listen. One of the great preamp/amp combos from before the gasket installation now sounds a bit too laid back. A different preamp/amp combo had been too thin sounding before and now is pretty spot on. Funny how a bit of refinement changes the mix.
I'll try to get some notes in order and post something as it's been fun dialing them in. In the mean time you guys have a great Christmas.